Electric meter.



P.. A. WILLsoN.

ELECTRIC METER. AIPLIOATION FILED NH12, 1911.

Patented July 2, 1912.

UNITED STATES PATENT OFFICE.

RUSSELL A. WILLSON, OF SPOKANE, WASHINGTON, ASSIGNOR QF ONE-HALF TO H.L. BLEECKER, OF SPOKANE, WASHINGTON.

ELECTRIC METER.

specification of'retters Patent.

Application led June 12, 1911.- Serial No. 632,744.

State of lllashillgton, have invented certain new and usefulImprovements in Electric Meters; and I do hereby declare the followingto be a full, clear, and exact description ofthe invention, such as willenable others yskilled in the art to which it apperta-ins to make' andIuse the same.

The primary object of this invention 1s to provide an electr1c maxlmumdemand meter which will record the maximum demand either theconsumer orthe seller.

. in volt-amperes as well as indicate the volts and amperes separately.

Sofar as I am aware lin known meters for indicating volt-amperes twoseparate instrumentsare required, one for recording volts, or avolt-meter, and the'other for recording amperes, or an ampere-meter,both having clock movements so that by computation kilovolt-amperes maybe known. Such instruments are open to many. objections; accuracy ofresults requires that the two clocks agree, and this not always beingpossible the result is that the instrument might either indicateincrease or decrease of the actual consumption, as a higher consumptionmight be requlred at attime when the voltage is high, or vice versa,thereby doing an injustice to By means of my -invention thesedifficulties are entirely overcome, and this is accomplished, in brief,

by separately controlling the two coperatingre'cordingelements of asingle instrument by the Voltage and amperage, enablingv a directreading of the volt-ampere without ,potential coil having an iron .alaminated armature; the armature and 'shyll ammmidlthe.

the necessity of computation.

, The invention will -be hereinafter fully set forth and particularlypointed out in the claims. In the accompanying drawing, the figure is anelevation of one form of embodiment of my present invention.

AReferring to the drawing, 1 designates a core 2 which is guided in itsmovements by a tube 3. This coilis connected in multiple with the linewires, and hence is controlle'dpby the voltage.

4 is a current coil which is connected in serieswith oneV ofthe linewires; 5 is the field pieces, which arepreferably laminated; 6 is 7 ayoke supporting field pieces; 8a the armature; tween gear with whichsaid gearing ance wheel weighted clockwise.

The armature o carries a marker in the form of a radially. extendingvarm or needle carrying atits free end, a. pencil or other suitable.agency` for marking on a chart. This marker is controlled wholly by theamperes, and hence is moved as the armature is infiuenced, but itsmovement, when the amperes increase, is limited by the escapement or anybeing set to any desirable speed of adjustment. The means employed forthis purpose may be varied lwidely, the escapementbeing shown merely byway of illustration. Whatever means is employed is intended to limit themovement of the marker only when there is an increase in the current andpawl 14 when the armature moves does vnot interfere with the movement oftheV marker when there is a decrease in the current.

15 is a chart whose holder I have shown as being pivoted at 16 andhaving an adjusting wei .ht or weights 17. At its outer end the chart,orits holder, is connected by a link 18 to the core 2 of the volt coil.The chart isv preferably in the shape of a segment of a circle, the voltlines 19 being drawn from v'the pivot of the chart-to its outer edge ona radius struck from the centerof the armature which is actuated by theamperes. The ampere lines 20 are'struck on dierent radii 'from the pivotof the chart holder.- Voltampere 'lines may also be drawn through equalvolt-ampere points on the chart. If desired, the latter Amay be made inthe form of a complete circle and, capable of being moved around itscentral pivot to enable several records to be taken on one chart.

From what has been said it will be understood that the chart iscontrolled wholly by the potential coil 1, which `latter may be provldedwith any suitable means for checking the moveme' .t's of its core andthus limit vthe effects of m nor` uctuations in the voltage and avoidtheir being recorded. The gmarker. .or recording needle is actuatedPatented July 2, 1912.

being mounted on a fixed sup# port 13. The gear wheel 8 is engaged by afother suitable governor capable of Wholly by the current or amperes, andthe 1 controlled, respectively, by the instrumenmay be employed tooperate on either altersome demand meters heretofore known; andi encin'gthe marker, and neither having any chart is moved practically in a rightangular direction to that of the marker, the result being that the voltsand the amperes are all recorded simultaneously and neither of thecoperating elements, the chart or the marker, has any influence onV theother. Thus by means of my invention I am enabled to obtain a recording,indicating and direct reading volt and amperes and voltamperes meter.

While I prefer to have a chart and marker talities actuated by the voltsand amperes, yet it is manifest that the same results may be obtained ifthe arrangement be reversed, and such change is to be considered Withinthe scope of my invention. The instrument nating current or directcurrent. In both instances it is accurate and reliable; it is notaffected by heat or cold, as is the case with its use dispenses with thenecessity o making computations in order to learn the voltamperes`recorded by the instrument.

While I have shown a very simple form of mechanism for carrying out myinvention, the attainment of the desired results do not depend upon anyspecial construction, sinceany-mechanism now used in alternating ordirect current ampere-meters and having suiicient torque could bevapplied in lieu of lwhat has been illustrated for operating the chartand the marker.

Various ways of carrying out the invention may readily suggestthemselves' to those skilled in the art. The object in every nstance isto obtain, in effect, a volt-ampere meter by combining a volt-meter andan ampere-meter, one for inuencing the movements of the chart, and theother for inuiniuence on the other.

I claim as my invention: j A1. A maximum demand'electrical recordinginstrument, comprising a movable voltage operated member, a movablecurrent operated member, a marker movable by one of said members, and achart movable .by the other of said members and adapted to form arecording surface for said marker, the said chart comprising a series ofvolt-indicating lines and a series of current-indicating lines, theposition of said marker on said chart at any time during the operationof the instrument indicating both current and voltage separately.

2. A maximum demand electrical recording instrument, comprising. amovable voltage operated member, a movable current opl erateo member, amarker movable by one of said members, and a chart movable by the otherof said members and adapted to form a recording surface for said marker,the said chart comprising a series of volt-indicating lines,- a seriesof current-indicating lines and a series of volt-ampere indicatinglines, the vposition of said marker on said chart at any time during theoperation of the instrument indicating current, voltage andvolt-amperage separately.

3. An electric recordin maximum. demand -instrument comprising, incombination vvith record-forming means including' a 7 pivoted charthaving voltage lines radiating from its pivot and amperage lines struckon radii from such pivot, a volt-controlled instrumentality for movingsaid chart, a marker for the chart, and anamperecon trolledinstrumentality for moving the marker.

4f. A maximum demand electrical recording instrument, comprising amovable voltage operated member, a movable current operated member, amarker movable by one of y said members, and a chart movable by theother of said members and adapted to form a recording surface for saidmarker, the said chart comprising a series of volt-indicating lines, aseries of current indicating lines, and a series of volt-ampereindicating lines, the position of said marker on said chart at any timeduring the operation of the instrument indicating current, voltage 9.

ing instrument, comprising a movable volt- 1y age operated member, amovable current operated member, a marker movable by one of saidmembers, and a chart movable by the other of said members and adapted toform a recording surface for said marker, the said l chart comprising aseries of volt-indicating lines, a series of current-indicating linesand a series of volt-ampere indicating lines, the position of saidmarker on said chart at any time during the operation of the instrument1 indicating current, voltage and volt-amperage separately, and meansfor retarding the movement of the marker on an increase in current butnot on a decrease of current.

In testimony whereof, I have signed this 1 specification in the presenceof two subscrlbing Witnesses.

RUSSELL A. WILLSON.

' Witnesses:

A. J. SoHULTHEss, L. E. SHEARs.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents.

Washington, D. C.

